[time-nuts] advice

Tom Van Baak tvb at LeapSecond.com
Tue Feb 21 15:01:08 EST 2017

Hi Rhoderick,

Check your estimates -- for 1 km the redshift should be 1e-13, not 1e-15.

The experiment is certainly possible. It's been done many times -- going up, and going down -- though usually above MSL. Doing it below MSL is on my TODO list; using either mine shaft (land) or bathysphere (sea). The logistics are a bit more complicated than driving clocks up a mountain. You can contact me directly for more info.

To get an idea of how these experiments are done, see:


----- Original Message ----- 
From: "Rhoderick Beery" <rjbeery at gmail.com>
To: <time-nuts at febo.com>
Sent: Tuesday, February 21, 2017 9:13 AM
Subject: [time-nuts] advice

> Greetings Time-Nuts!
> I'm a physics theorist interested in performing an experiment to measure
> the gravitational time dilation beneath the surface of the Earth. Boulby
> Labs in the UK is 1.1 km down which would generate a time differential from
> the surface on the order of 1 part in 10^15 -- not much to work with!
> I've investigated measuring redshift/blueshift from lasers but our
> wavemeter technology is no where near accurate enough. I've concluded that
> my best solution is to use atomic clocks, of which I know very little
> about. I thought a clock-enthusiast mail group would be a fantastic way for
> me to learn about the subject as well as possibly spur ideas on the lab
> test design itself.
> Thanks in advance!!
> -------
> Rhoderick Beery
> direct: 402-817-9363
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